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**mRNA-1012** is Moderna's investigational pentavalent seasonal influenza mRNA vaccine candidate. It contains five mRNAs encoding influenza-virus hemagglutinin antigens: WHO-recommended 2022–2023 Northern Hemisphere A/H1N1, A/H3N2, and B/Victoria components, plus A/Newcastle/1/2021 and A/Hong Kong/45/2019 H3N2 components in place of a B/Yamagata component. The vaccine is intended to induce protective humoral immune responses against influenza A and B, with expanded A/H3N2 coverage. It was evaluated at 50.0 μg and 62.5 μg in a Phase 1/2 study in healthy adults aged 50–75 years. ([pubmed.ncbi.nlm.nih.gov](https://pubmed.ncbi.nlm.nih.gov/?term=39245055))
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